What I know about them personally, is that I’ve never had one of them get in the way of what I was going to do as a consumer.
I’ve read about others having problems, having to do with various things that they want to do, but I’ve just never had a problem with them. Maybe I just don’t do too much with my software, or whatever it is, that causes me, as a user to not have problems with them, I just don’t know... :-)
Usually you just violate it without knowing. Try actually reading a EULA sometime. They can be downright scary.
Some Microsoft EULAs say you "may not without Microsoft's prior written approval disclose to any third party the results of any benchmark test." Claria says you can't even use a packet sniffer on your computer. And they get worse.